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GotoAID

One of the most fleshed out first aids available on iOS or Android, GotoAID allows runs the full gamut of medical care—everything from bee stings to broken bones is covered here. There's also a section for natural disaster preparedness that covers not just earthquakes, tornadoes, and hurricane, but also snowstorms, volcanic eruption, damn failure, and landslides. There's also a Morse Code translator that allows you to type in a message that gets sent via your phone's light signals.